Method for the mixed firing of boilers.



E. KOERTING.

METHOD FOR THE MIXED FIRING OP BOILERS.

APPLICATION FILED I m. 20, 1912.

1 1 1 8, 1 37. Patented Nov. 24, 1914.

' Fla; 2-

{F2 i I $7 S oi a R I HZVEIVTOR WITNESSES d Z d BY 9 I 2 F ATTORNEY v ERNST KOERTING, F PEGLI, ITALY.

METHOD FOR THE MIXED FIRING OF BOILERS.

s ecifiedtigirouea s Iiatent.

: Patented Nov. 24, 1914.

Application filed January'20, 1912. Serial No. 672,492.

To all whom it may concern Be it known that I, ERNST KoER'rr'NG, a

subject of the Emperor of tiermany residing at Pegli, in the Province ofLiguria and Kingdom of Italy, have invented a certain new and useful Improvement in Methods for the Mixed Firing of Boilers, of which the following is a true and exact description, reference being had to the accompanying drawings, which form a part thereof.

My invention relates to the mixed firing of boilers by coal and oil. In boiler plants having provision for such mixed firing the main reliance for the heating of the boilers is upon the coal fire, the oil being used to force the capacity of the boilers by supplementing the coalfire or as a temporary substitute for the coal where its use is not convenient. As heretofore used the employment of oil in connection with a coal fire has resulted in the production of an excessive amount, of smoke, which is particularly objectionable in ships of war and the object of my invention is to provide a method and an apparatus specially adapted for the practice of the method wherebythe same firebox can be used for the combustion of both coal and oil without the production of excessive smoke.

I have discovered that the objectionable smoke in mixed firing is due in part to the falling of particles of oil upon the coal bed and partly to the mixing of the unconsumed oil particles with the products of combustion arising from the coal fire and that it can be avoided by injecting the oil in such a way as to avoid physical contact of its particles with the coal and in connection withan air supply which will support combustion of the oil and at the same time will furnish a screen or curtain of air to separate the burning oil from the gaseous products arising from the coal bed and my invention consists. broadly speaking. in the method of introducingoil into a firebox having provision of a grate fire of coal which consists in injecting the oil above the coal bed in the form of a flat spray of a finely divided mist of oil particles so directed as not to impinge upon the coal and at the same time introducing into the firebox a separate supply of air to support the combustion of the oil, a part of such air supply being so introduced as to form a layer or curtain of air separating the;

oil spray from the gases arising from the coal bed.

My invention further consists in a special apparatus for applying my new method,

and as a whole and in detail will be best understood as described in connection with the drawings, 1n whlch:

Figure 1 IS a sectional elevation of a conventional fire box having my improved ap- I pliances for mixed firing and showing in a diagrammatic way the operation of. m method. Fig. 2 is a front view of the boiler setting showing my appliance. Fig. 3 is an enlarged elevation showing my preferred structure for injecting the oil and providing and regulating the air supply for the oil jet. Fig. 4 is a plan view on a still more enlarged scale of the device shown in Fig. 2 for clamping the oil spraying nozzle to the oil supply conduit. Fig. 5 is a sectional view of the oil spraying head taken as on line 5-5 of Fig. 6 and Fig. 6 is a sectional view taken as on line 6-6 of Fig. 5.

A isthe ordinary grate for a coal fire situated at the bottom of a firebox A arranged for heating a boiler indicated at C and which may be of any convenient design.

B is a bridge wall, at the side of the fire chamber and D a fire box crown or baflie arranged to send the products of combustion back over the bridge wall.

E is the front wall of the boiler setting having the usual fire door or doors F, ash A,

doors G and having also a longitudinal opening H for the oil and air admission peculiar to 'my invention.

I is the oil feed pipe having an upwardly bent extension I and a spur like extension I The extension I as shown curves inward at its upper end and has a terminal flange I K is the oil main having one or more branch pipes K which, as shown, have terminal flanges K and stop cocks L. The flanges I and K fit against each other and are clamped together by any convenient device permitting the readyremoval and re placement of the oil feed pipe I. As shown, the flange K isprovided with trunnions M M on which is pivoted a yoke N having a wheel screw N screwing into its end and provided with a fork N which presses against flange I and clamps it against flange K.

To the end of the feed pipe I which projects into opening H is secured a spray head 0 secured in place by a screw cap Q and formed so as to project a flat jet of oil mist through opening 2 opening at R into the fire box in such a direction that the -jet will not tend to impinge upon the coal fan like spray indicated at V. l have added to Mr. Fischers device a passage 0 forming a continuation of passage 0 in which I place a cleaning needle or rod P passing through the spur 1 of pipe and stuffing box J at its end and having an exterior handle P by which it can be at will thrust forward to clean or close passage 0.

In order to regulate the admission of air H, I provide shutters lit and R hinged at the top and bottom of the R and having attached to them' threaded nuts S, S, in which screw right and left handed screw threads formed on rod T, said rod T being supported on a collar T and having a hand wheel 'l It will be sr vn that the air entering below th jet over shutter R will form a screen or curtain as shown at W separating the oil jet V from the products of combustion from the grate fire indicated at U while the air enter- 7 ing under shutter R will overlay the oil jet as shown at W.

It will be understood that save as specifi cally called for in the claims I do not wish to be understood as in any way limiting myself to the presence or use of the specific devices hereinabove described.

what

Having now described my invention, 1 claim as new and desire to secure by Letters Patent is, i

' firebox in 1. The method of securing an energetic a combustion of oil without excessive formation of smoke in a boiler firebox containing a grate supported fuel bed of burning coal, which consists in introducing the oil to the firebox in the form of a spray of a finely divided mist of oil particles and simultaneously introducing air for the combustion of the oil a part of which is introduced into the firebox in the form of a flat layer intervening between the fuel bed and the oil spray and separating the oil spray from the fuel bed and its products of combustion.

2. The method of securing an energetic combustion of oil without excessive formation of smoke in a boiler firebox containing a grate supported fuel bed of burning coal, which consists in introducing the oil to the the form of a flat spray of a finely divided mist of oil particles approximately parallel to the fuel bed on the grate and simultaneously introducing air for the combustion of the oil, a part of which air is introduced in the form of a flat layer separating the oil spray from the fuel bed and its products of combustion.

3. The method of securing an energetic combustion of oil without excessive formation of smoke in a boiler firebox containing a grate supported fuel bed of burning coal, which consists in introducing the oil to the firebox in the form of a flat spray of a finely divided mist of oil particles approximately parallel to the fuel bed on the grate and simultaneously introducing air for the combustion of the oil in the form of two flat layers above and below the oil spring, the lower layer separating the oil spray from the fuel bed and its products of combustion.

ERNST KOEPLTING.

Witnesses A. ldonaenvo, alas. A. SMITH. 

